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Poster: sambonk2 Date: Feb 4, 2010 9:30am
Forum: GratefulDead Subject: Re: Wall of Sound

The wall of sound was whole different animal...As Weir puts it in the 2-3-73..."we are testing out a new sound system..hopefully by the end of the evening,it will stand up and grow some hair"this was the birth was what was to become THE WALL.In simple terms:
Each speaker had a guitar string,piano key,or Drum to its outputs.On a normal sound sound system,the monitors are in front of the band usually in front of the musician.The wall had the sound coming from behind the band.Problem solved by phasing the mics..that why they had 2 mics on the stand..see photo
http://www.hometoys.com/ezine/09.04/hinton/garcia3-mics.jpg

The vocals from the wall were very thin sounding.Eveything else very much like a home stereo system.
The Archive has some nice recordings from the AUD.This one captures the wall from your Ears
http://www.archive.org/details/gd1974-06-23.akgd1000e.moore.berger.105755.flac24

Jeery morre did a great job on these.I perefer the AUD to SBD from this year.Thats just me folks.
The time and money they must have spent to haul the gear around,set it up and move...no wonder they and to hang it up for a year..
This sound system did change everything in music.Kudos to Alembic.....

If there was a SBD from this year 6-30 is very very tasty
http://www.archive.org/details/gd1974-06-30.sbd.miller.96275.sbeok.flac16

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Poster: dead-head_Monte Date: Feb 4, 2010 11:01am
Forum: GratefulDead Subject: Re: Wall of Sound

Winterland - NYE - 12.31.72 - single mics on vocals
19721231_1996.jpg

The way I understand it, once Bear and Ron Wickersham worked out the usage of dual anti-phased mics for the vocals - to eliminate feedback, that was the birth of the wall of sound. The rest of the mics and pickups could always have their feedback signals managed and eliminated. Getting the singers and sound engineers to agree to "eat the one mic only" must have taken lots of courage. The mics were spread 60 mm apart. The wall of sound was built around this signal cancellation principle, and it evolved from there.

birth of the wall of sound
2.19.73
19730219_2181.jpg
3.24.73
19730324_2176.jpg

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Poster: rippley Date: Feb 4, 2010 11:59am
Forum: GratefulDead Subject: Re: Wall of Sound

Wow, I never knew the boys ever wore Nudie suits. Sweet!
For those interested in the man who outfitted everyone from Porter Waggoner to Elvis to Gram Parsons, to, well, The Dead, check out

www.nudiesrodeotailor.com/

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Poster: bluedevil Date: Feb 4, 2010 12:46pm
Forum: GratefulDead Subject: Re: Wall of Sound

Gotta to love the nudies:

http://www.archive.org/iathreads/post-view.php?id=253466

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Poster: dead-head_Monte Date: Feb 4, 2010 12:22pm
Forum: GratefulDead Subject: Re: Wall of Sound

here's Phil's outfit on 2.19.73

Phil's Alembic bass and his rig

19730219_2182.jpg

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Poster: Gus Fan Date: Feb 4, 2010 12:31pm
Forum: GratefulDead Subject: Re: Wall of Sound

Great pic. I wonder why Alembic didn't add one more knob. It looks like there's room.

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Poster: dead-head_Monte Date: Feb 4, 2010 1:06pm
Forum: GratefulDead Subject: Re: Wall of Sound

Here's the theory for the vocal mic pairs used in the evolving prototype WOS (1973) and the WOS (1974). They are chosen and used in anti-phased (opposite-phased) mic pairs, spread 60 mm apart, and setup for feedback cancellation. Ron Wickersham desribes in detail many of these parameters. I can show you how simple the wiring and hookup configuration is. I would make sure that both mic cables in each pair are exactly the same length.Balanced audio lines are used to create the differential signals that get summed together to eliminate feedback. Here's how to connect them using XLR connectors.

540px-XLR_pinouts.svg.png

Pin 1 is always chassis "ground" or the cable shield. The normal-phased mics get wired with pin 2 as "hot" signal and pin 3 as "cold" signal. The opposite-phased mics get wired with pin 2 as "cold" signal and pin 3 as "hot" signal. Normally the sound signals (feedback from the WOS) are input at exactly the same level into both mics. These mic signals then get summed together. The result is always zero signal. You are adding together equal and opposite signals. This always causes signal cancellation. Each vocalist must "eat" just one mic only when singing into his/her vocal mic. This vocal source is now a single mic output, and does not get cancelled out. But when the singer moves 12 inches away and sings for example, it is almost all cancelling out. It can be tricky to use and learning how to eat just one mic. The sound crew also need time getting used to it.

anti-phased mic pairs are shown close-up w/ Bob and Phil eating vocal mics from RFK Stadium in 1973
here's the audio stream of incredible quality sound from my AUD.fob tapes for RFK Stadium — June 10, 1973

this pic is a close-up from June 9
19730609.jpg

this pic is June 10 - the proto-wall is stacking up behind the vocal mics
rfk19730610_0977_cropped.jpg

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Poster: sambonk2 Date: Feb 4, 2010 11:15am
Forum: GratefulDead Subject: Re: Wall of Sound

well put Monte

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Poster: midnight sun Date: Feb 4, 2010 12:44pm
Forum: GratefulDead Subject: Re: Wall of Sound

hey sambonk, good to see you posting again

not to knit pick, but i have to question your statement, "Each speaker had a guitar string,piano key,or Drum to its outputs." the info indicates only Phil's bass had 4 channel capability, the guitars would have been single channel and the keys 2 output with the lows separated from the mids and highs (sorry if i misunderstood what you were getting at)


question for Monte, in your excellent post;
http://www.archive.org/iathreads/post-view.php?id=256492
there is a shot, "Jerry's rig shows the McIntosh 3500 tube amplifiers"...always thought he used a single McIntosh 2300 solid state power amp (as per description of guitar system further down), his reason being he felt power tube amps were too unstable at higher volumes (only using the tubed pre-amp of the Fender Twin)


as a musician yourself Sam, you can no doubt appreciate "hearing what your audience hears", but also have to wonder how earsplitting it would be that close to the source night after night (?)

This post was modified by midnight sun on 2010-02-04 20:44:25

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Poster: sambonk2 Date: Feb 4, 2010 12:49pm
Forum: GratefulDead Subject: Re: Wall of Sound

i stand corrected!!...nice work....gota love the knowledge here in Lama